Description

The Celestron Off-Axis Guider uses a prism to intercept a small portion of the telescope’s focal plane (outside the field of view of the main imaging camera) to locate a guide star.

Any movement seen by the guide star will be the exact same movement seen by the imaging camera.

Guiding this way will correct for tracking errors, as well as opto-mechanical errors or flexure. The result: better astroimages with pinpoint round stars.

The Off-Axis Guider is an essential astro-imaging accessory for long focal length telescopes that require the most accurate guiding possible.

Off-Axis Guiders have been around for a long time, but typically pose three main challenges:

Finding a guide star from the far edges of the telescope’s focal plane can be difficult, considering the small field of view and sometimes less-than-ideal illumination.

Getting both imaging camera and autoguider to reach focus with one another is time consuming and sometimes requires experimentation.

Additional spacers and adapters are usually required for your particular camera, telescope, and autoguider, which adds to cost and complexity.

Celestron’s Off-Axis Guider addresses these challenges by:

Providing a large 12.5mm prism that can be adjusted to move closer to the center of the telescope’s focal plane, depending on the size of the imaging camera. This results in brighter guide stars, with the help of the large prism to fully illuminate the autoguider sensor.

Including all the needed spacers and adapters are included for most common imaging configurations, including DSLR cameras, Nightscape CCD cameras, and more. The following adapters are included: SCT/EdgeHD, female M48, female M42 (T-thread), male M48, male M42 (T-thread), 3 T-thread spacers

Additonal Specifications

Helical Focuser Travel: 8mm

Telescope Connection: M42 T-thread, M48, and SCT/EdgeHD

Autoguider Connection: M42 T-thread, and standard 1.25″ adapter

Camera Connection: M42 T-thread, and M48

FEATURES

Most accurate way to guide – improved accuracy compared to using a separate guide scope.

12.5mm multi-coated prism with aluminized backing for maximum reflectivity and illumination to the autoguider

Includes adapters with the correct spacing for DSLR cameras, Nightscape CCD and other popular astroimaging cameras

Ideal for Schmidt- Cassegrain and EdgeHD telescopes

SPECIFICATIONS:

Weight (oz):18 oz (510 g)Clear Aperture (mm): 48mm mm (1.89 in)

Please Note: The optimum photographic back focus of the EdgeHD 8” when used with #94242 Reducer Lens at f/7 is 105 mm (please note, the back focus distance for Edge 8″ without the reducer is 133mm)
Our #93648 Off-Axis Guider, when used with the reducer #94242 and a DSLR, reaches appx 120mm (other imaging equipment may vary, please carefully work out your distances prior to purchase)
Therefore because the 105mm distance is so critical, the Off-Axis Guider is not typically compatible for use with a DSLR, EdgeHD 8″ and Reducer lens
The EdgeHD 11″ and 14″ all keep the same 146mm back focus with or without the reducer so are not affected.

Reviews

UK DeliveryPrices include postage to all mainland UK addresses, except where indicated. Larger items may attract a surcharge for off shore or remote locations.When your item is dispatched, you will receive an email from our shopping cart saying ‘Your order is complete’We use Royal Mail and Courier services, whichever is more appropriate for the weight and value of your order.International Delivery:Website prices DO NOT include International delivery costs unless specified at checkout.We are happy to ship to most countries. We use a variety of Royal Mail and Courier services, depending on the weight, size, value and urgency of your order.Place your order via the shopping cart and you will be advised by email of additional shipping charges prior to the processing and dispatch of your order.Or simply email us for details of shipping charges to your country before you place your order.Some items which are particularly popular with overseas purchasers already display, in the purchase menu, combined purchase and shipping costs to various regions adjusted for UK VAT (sales tax) where necessary.If you reside outside the European Union, please check with your customs authorities for details of any import taxes, duties and other charges that may be imposed on entry to your country. We have no control over these.